RR Tau UX Ori BF Ori Covered by large dust grains in the - PowerPoint PPT Presentation

RR Tau UX Ori BF Ori

Covered by large dust grains in the foreground disk? Gahm + (1988, 1993): RY Lup, type TTS V FLIPS on < 1 hours (B – V) UX Ori S Cr A (Gahm, Petrov, Tambovtseva, Grinin Stempels, Walter 2018) possible flips < 1 day Q1: Any colour flips in UXORs?

Vincovic´ & Juric´ (2007) > 40 o ? Kreplin+ (2016), Davies + (2018) Dullemond + (2003) Shulman & Grinin (2019) Tambovtseva & Grinin (2008) Q2: Dusty fragments far above the disk?

2019: Gahm, Djupvik (NOT) + Luleå Technical University also: Grinin and Krelowski NOT: spectra R = 25 000, 3600 – 9400Å. Photometry: Swedish Amateur Astronomy Org. Next run: WHEN? Grinin + (2001) To be continued Rodgers + (2002)

UX Ori 2019 Na I D He I D fainter fainter Natta+ (2000), Potravnov+ (2019) +60 km/s (to +140) During accretion event: no related occultatio n Q3: Any ecidence of spectrocopic binaries?

RR Tau 2019 [O I] [O I] MIN Contrast effect: the line FLUX is very constant MAX RV = 0.0 km/s. RV star: +11 km/s ? ∆ V = 58.1 km/s (FWHM)

RR Tau 2019 [ S II] lines Appenzeller+ (1984) [Fe II] [Fe II] Fe II [Fe II]: higher critical density than [S II] Q4: Is the RR Tau disk tilted? Confirmation? ALMA

RR Tau2019 H b Rel. Flux MIN MAX - 400 km/s to + 400 km/s Intrinsic variations: difficult to map inner region Rodgers et al.

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ANY MOLECULAR LINES IN THE LINEOFSIGHT ? First test if DIBs are enhanced in UX-objects when occulted: Andersen, Gahm, Krelowski (1982) for HR 5999 Result: DIBs are not enhanced. SIGNATURES FROM COLD GAS WHEN RR TAURI IS OCCULTED ? Species Enhanced when occulted? Ca I, Mg I, K I ground state no DIBs no (not enhanced in shells(H II) C 2 (2 – 0), C 3 no (enhanced in shells/H II) CH, CH + no (enhanced in shells/H II) CN no NH 2 no Overtune CO 2.3 µ to be Ilee+ (2014) Fluorescent H 2 2.1 µ µ to be

Open questions Q1: Rapid colour flips in UXORs? Q2: How to bring large bodies with large dust grains far above the disk? Q3: Evidence of spectroscopic binaries? Q4: Is the RR Tau disk tilted? Size of inner holes? Q5: Any mapping of UX Ori stars with ALMA? Q6: Detecting which molecules in the sightline?